Re: [Discuss-gnuradio] Full duplex and half duplex doesnot work

[Lebowski80]

How did you resolve your problem? I have the same problem and reading your
post I cannot understand the solution of your one.

Thanks in advance


blwfsoj wrote:
> 
> Hi all,
> Before i start telling about my problem, i want to mention that i have
> already read the post named "help: cannot send after transport endpoint
> shutdown" which is very close to my problem but i could not solve it.
> 
> I'm trying to transmit from the usrp  port A, and then make it receive at
> the same port using "Auto T/R" which i expressed by typing "-v" (isn't it
> correct) after the benchmark.
> but some time it works and most of the times its not (not stable), when
> its not working it shows me the following error:
> address@hidden:~/Documents/abbasi/programmitx.py -f 1200000000 -m dbpsk -v
> --tx-amplitude=0.08 -T A
>>>> gr_fir_ccf: using SSE
> 
> Modulator:
> bits per symbol:     1
> Gray code:           True
> RRC roll-off factor: 0.35
> Tx amplitude     0.08
> modulation:      dbpsk_mod
> bitrate:         100kb/s
> samples/symbol:    2
> USRP Sink: A: Flex 1200 Tx MIMO B
> Requested TX Bitrate: 100k Actual Bitrate: 125k
> Warning: failed to enable realtime scheduling
> address@hidden:~/Documents/abbasi/programmirx.py
> -f 1200000000 -m dbpsk -v
>>>> gr_fir_ccf: using SSE
> 
> Demodulator:
> bits per symbol:     1
> Gray code:           True
> RRC roll-off factor: 0.35
> Costas Loop alpha:   1.50e-01
> Costas Loop beta:    5.62e-03
> M&M mu:              0.50
> M&M mu gain:         1.00e-01
> M&M omega:           2.00
> M&M omega gain:      2.50e-03
> M&M omega limit:     0.01
> 
> Receive Path:
> modulation:      dbpsk_demod
> bitrate:         100kb/s
> samples/symbol:    2
> usrp_open_interface:usb_claim_interface: failed interface 2
> could not claim interface 2: Device or resource busy
> usrp_basic_rx: can't open rx interface
> Traceback (most recent call last):
>   File "mybenchmark_rx.py", line 112, in <module>
>     main()
>   File "mybenchmark_rx.py", line 101, in main
>     tb = my_top_block(demods[options.modulation], rx_callback, options)
>   File "mybenchmark_rx.py", line 45, in __init__
>     self.rxpath = usrp_receive_path.usrp_receive_path(demodulator,
> rx_callback, options) 
>   File
> "/home/onur/Documents/abbasi/programming/examples/digital/usrp_receive_path.py",
> line 68, in __init__
>     self._setup_usrp_source(options)
>   File
> "/home/onur/Documents/abbasi/programming/examples/digital/usrp_receive_path.py",
> line 73, in _setup_usrp_source
>     self.u = usrp_options.create_usrp_source(options)
>   File
> "/home/onur/Documents/abbasi/programming/examples/digital/usrp_options.py",
> line 88, in create_usrp_source
>     gain=options.rx_gain,
>   File
> "/home/onur/Documents/abbasi/programming/examples/digital/generic_usrp.py",
> line 144, in __init__
>     _generic_usrp_base.__init__(self, **kwargs)
>   File
> "/home/onur/Documents/abbasi/programming/examples/digital/generic_usrp.py",
> line 63, in __init__
>     except: raise Exception, 'Failed to automatically setup a usrp
> device.'
> Exception: Failed to automatically setup a usrp device.
> address@hidden:~/Documents/abbasi/programming/examples/digital$ 
> 
> ON THE OTHER HAND: 
> when i try the full duplex (use a slot from block A as transmitter and
> slot from block B as receiver) it also doesnot work. it will not be able
> to setup the interface.
> 
> i appreciate your  help,
> regards,
> 
> 

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